linux-kernel - Re: [PATCH v8 3/7] mux: add help text for MULTIPLEXER config option

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Message-ID: <39f3891c-c05a-4e10-9ad4-ab3cbc6fa70e@solid-run.com>
Date: Mon, 9 Feb 2026 10:12:17 +0000
From: Josua Mayer <josua@...id-run.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
CC: Marc Kleine-Budde <mkl@...gutronix.de>, Vincent Mailhol
	<mailhol@...nel.org>, Vinod Koul <vkoul@...nel.org>, Neil Armstrong
	<neil.armstrong@...aro.org>, Peter Rosin <peda@...ntia.se>, Aaro Koskinen
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	<krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Geert Uytterhoeven
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Subject: Re: [PATCH v8 3/7] mux: add help text for MULTIPLEXER config option

On 09/02/2026 10:06, Geert Uytterhoeven wrote:
> Hi Josua,
>
> On Sun, 8 Feb 2026 at 16:16, Josua Mayer <josua@...id-run.com> wrote:
>> On 03/02/2026 15:01, Josua Mayer wrote:
>>> Add prompt and help text for CONFIG_MULTIPLEXER to allow enabling this
>>> option thorugh the kernel configuration without explicit "select" driver
>>> dependencies.
>>>
>>> Select it by default when COMPILE_TEST is set for better coverage.
>>>
>>> Signed-off-by: Josua Mayer <josua@...id-run.com>
>>> ---
>>>    drivers/mux/Kconfig | 8 +++++++-
>>>    1 file changed, 7 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig
>>> index c68132e38138..e31c46820bdf 100644
>>> --- a/drivers/mux/Kconfig
>>> +++ b/drivers/mux/Kconfig
>>> @@ -4,7 +4,13 @@
>>>    #
>>>
>>>    config MULTIPLEXER
>>> -     tristate
>>> +     tristate "Generic Multiplexer Support" if COMPILE_TEST
>> This didn't do what I thought it would.
>> It was my intention to allow enabling this through menuconfig / .config.
>>
>> With the syntax above menuconfig shows:
>>
>> │ Symbol: MULTIPLEXER [=n]
>> │ Type  : tristate
>> │ Defined at drivers/mux/Kconfig:6
>> │   Prompt: Generic Multiplexer Support
>> │   Visible if: COMPILE_TEST [=n]
>>
>> This means it cannot be selected.
> Looks like you haven't enabled COMPILE_TEST first?
Correct.
But CONFIG_MULTIPLEXER should be visible always,
not just when COMPILE_TEST is set.
>
>> Instead I (think I) should use
>> default m if COMPILE_TEST
> No, merely enabling COMPILE_TEST must not enable additional
> functionality.
>
>> Since my patch-set broke x86_64 allmodconfig and failed merge into
>> linux-next,
>> this presents an opportunity to change the above as well with v9.
> Ulf has already applied this series to mmc/next.
What would be the process to fix the build error for x86_64 allmodconfig 
now?
>
> Gr{oetje,eeting}s,
>
>                          Geert
>